CLUSTER: Add and subtract within 20.
2.OA.2. Fluently add and subtract within 20 using mental strategies.
6
By end of Grade 2, know from
memory all sums of two one-‐digit numbers.
Not applicable.
See EE.2.NBT.6–7 and EE.3.OA.4.
CLUSTER: Word with equal groups of objects to gain foundations for multiplication.
2.OA.3. Determine whether a group of objects (up to 20) has an odd or even number of members,
e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a
sum of two equal addends.
EE.2.OA.3. Equally distribute even numbers of
objects between two groups.
2.OA.4. Use addition to find the total number of objects arranged in rectangular arrays with up to 5
rows and up to 5 columns; write an equation to express the total as a sum of equal addends.
EE.2.OA.4. Use addition to find the total number of
objects arranged within equal groups up to a total of
10.
6
See standard 1.OA.C.6 for a list of mental strategies.
COMMON CORE ESSENTIAL ELEMENTS for MATHEMATICS
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